Markerboard



FIG. 1 is a top, left front perspective view of a markerboard showing my new design, the eraser tray being depicted by means of broken lines for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a right side elevational view, the left side being a mirror image thereof;

FIG. 4 is a sectional view thereof taken between and in the direction of arrows IV--IV, in FIG. 2;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a markerboard, as shown and described. 